PSD Files can save a lot of time and also you can improve your skills by seeing which techniques have been used to create them. So here are collection of free PSD icons, mock-ups, backgrounds, ui kits, etc.

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80 Shades of White Icons

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iPhone Holding Hand

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Clock

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Minimal Light User

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Othericons.com (set)

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Minimal iPhone

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iOS 7 iPhone PSD

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MacBook Pro

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iGravity

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Free iPhone Mockup PSD

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Circle Menu PSD

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Rethinking the new Yahoo

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Freebie PSD: Flat UI

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UI Kit (PSD)

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iGravertic

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Ui Kit

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Thin Stroke Icons

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Map Markers PSD

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Free Flat Icons

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Knobs Free PSD

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Rated

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Light Switches (PSD)

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Apple flat devices

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Simple Icon PSD

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Radio Player

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Minimal iPhone

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Book Template – Free PSD

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Free Icons

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Minimal iOS/Browser

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Free Credit Card Icons

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[.PSD] Remind~Me More

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Flat Devices

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Ecommerce Elements (PSD)

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Pinterest Thumb

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Register UI

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Event Members – Free PSD

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Travel App (PSD)

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Bicycles icons PSD

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Creative Status Single

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Message Widget

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PSD (Free download)

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Free iPad White Angle PSD

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iOS 7 Icon Guides PSD

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63 Icons (PSD)

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Free login PSD

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HTC One and Galaxy S4

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Disc

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Clock iOS Icon [ PSD]

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UI PSD KIT

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Music Player

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Stationery Template

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Beach GUI

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Freebie: UI Kit PSD

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Freebie PSD: Flat

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Compact Keyboard

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Lookamore UI Kit

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Freebie: Map Controls PSD

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Drag 2 Upload ~ Widget

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Transparant UI Kit

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12 Blurred Backgrounds

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